The authors describe the processing of electro-encephalograms (EEG's) by means of a mini computer in the clinical neurophysiological department of a district hospital. The new way of processing not only creates the possibility of digital filing of EEG signals, but also allows new methods of presentation and quantification of EEG's. Thus, for example, cerebral deviations can be made visible in the electrical brain signal, when they are not perceptible to the naked eye.